Method of making and repairing piston-rods



v A, E. ZUM WALT. METHOD OFMAKING ANU'REPAIRING PISTON RODS. APPLICATIONnuzo JAN/2'4, 192p.

1,55%,624; Patented A r. 12, 1921 UNITED stares Th5? eerie ALvA E.ZUMWALT, or CANEY, KAnsAsf .METHOID, on MAKING AND REPAIRINGPrsrron-Rons.

Application filed January 24, 1920. Serial nassaeos,

To all whom it may concern: w r

Beit known that I, ALVA la. AUarwAL'r, a citizen of the United States,reslding at Caney, in the county of Montgomery and repairing thesepiston rods when they become worn.

The common practice today when the piston rod of a pump, steam engine,or like part becomes worn at the point where t passes through thebearing or stufiing box of the cylinder is to remove the rod and replaceit by a new rod. Because of the lngh cost of material, this is arelatively costly operation, and the general object of my 1nvention isto provide means whereby the piston rod may be repaired and'put in asgood shape as it was originally w thout the necessity of throwing awaythe piston rod, this repairing of the piston rod costing a relativelysmall amount. 7

A further object is to so repairthe piston rod that the piston will beas firmly held in place upon the rod as it would have been if no repairshad been made.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein:

Figure 1 is'a sectional view of a portion of an engine cylinder showingthe stuffing box and showing in section the piston and the repair sleeveof the piston rod;

Fig. 2 is an elevation of the piston rod after it. is turned down toreceive the sleeve;

Fig. 3 is a sectional view of the sleeve.

My method of repairing the piston rods of pumps, engines and like partsI have inpractice found to be extremely cheap and effective. piston rod10 and turning it down to a less diameter, as at 11, along that portionof the rod which passes through the stuffing box 12 in the cylinder head13. This reduced portion 11 extends from the shoulder 14 against whichthe piston 15 bears to a Specification of Letters Patent.

It consists in'taking the worn Patented Apr. i2, 1921.

point beyond the extremity of the stroke of i the piston rod, thusforming a shoulder 16 on the piston rod. Of course, the piston has beenremoved in order-to permit the piston rod to be turned down, and afterthe p ston rod is turned down, a bushing 17 of brass, steel, or othersuitable metal is slipped over the reducedportion of the piston rod,

this bushing-preferably having a tightfit on the reduced portion of thepiston rod. The bushing has a length exactly equal to the distancebetween the shoulders 14 and 16 and is forced firmly into place sothatthe end of the bushing or sleeve 17 will be 00- incident with andform a continuation of the shoulder 14. The'piston 15 is thenput inplace, and has its full bearing upon the extremity of the bushing 17 andagainst shoulder 14. Of course, the construction of the piston and themanner-in which it is held in place'formno part of my invention. The.piston rod so repaired 1s in every respect equal to a new piston rod,and it is obvious that when the sleeve 17 becomes so much worn thatsteam or water will escape around the packing in the stuffing box, thenthe rod may be removed and a new sleeve or bushing 17 put in place, andthat this replacement of worn sleeves by new may be continuedindefinitely without necessitating thethrowing away of the piston rod.As an example of the saving which is effected by the method aboveoutlined, I may state that certain half brass piston rods cost about$48. Thus, if the old piston rod is thrown away, it will cost thisamount to replace the piston rods. To repair the rod by the means whichI have described costs about $3.15..

This method of repairing piston rods can be applied to any piston,steam, water, or oil, or applied to any rod which works in p bearings,and it is obvious also that the sleeve or bushing may be made of anyde-' slred metal. 7 I brass 1s preferable, butfor oil plstonssteel Forwaterand steam pistons,

bushings may be used. This method of repairing or constructing thepiston rod may be applied to polish rods on oil jacks;

I 'olaimzi 1. A method of repairingworn reciprosisting in reducing theworn portion of the.

rod to a diameter less than its normal diameating rods passing throughbearings conrod and having an exterior diameter the same as thenormalexterior diameter of the rod before it is reduced. V 2. A method ofrepairing piston rods carrying pistons and reciprocating throughbearings consisting in reducing the diameter of that portion of the rodwhich passes through the hearing from the inner face of the piston andplacing uponthis reduced portion a bushing having a length equal to thereduced portion whereby the bushing 'will bear against the shoulderformed at the unction of the reducedportlon W1th' the. unreduced portionof the piston and at its other bear against the piston itself,

,said bushing having an exterior diameter the same as the normaldiameter of the pisssignature.

ALVA E. ZUMVVALT.

